Assigxoe to the huyett



(No Model.)

W. D. SMITH.

ROTARY VENTILATING FAN.

No. 389,030. Patented Mar. 30, 1886,

N PETERS FhnI Lilhcgmphun wankm, 0 c" lhvrTEn STATES PATENT QEETQE,

XVRIGHT D. SMITH, OF DETROIT, MICHIGAN, ASSIG-NOR TO THE HUYETT 8tSllIlTH MANUFACTURING COMPANY, OF SAME PLACE.

ROTARY VENTILATING-FAN.

SPECIFICATION forming part of Letters Patent No. 339,030, dated March30, 1886.

Application filed October 1, 1583. Renewed January 21, 1885. Againrenewed December 17, 1885. Serial No. 183,070. (No model.)

To all whom, it may concern.-

Be it known that WRIGHT D. SMITH, of Detroit, in the county of XVayneand State of Michigan, have invented new and useful Improveinents inRotary Ventilating-Fans; and

I do hereby declare that the following is a full, clear, and exactdescription thereof, reference being had. to the accompanying drawings,which, form a part of this specification. This invention relates tocertain new and useful improvements in the construction of rotaryventilating-fans and the invention consists in the peculiar constructionof the wheel, in the peculiar means for furnishing I 5 bearings to thefan-shaft, and in the peculiar construction, arrangement, andcombination of the various parts, all as more fully hereinafter setforth.

The purposes for which this fan is designed 2c are principally forventilating buildings, mines, malt houses, &c.; also for various kindsof malt-houses where a large volume of air is required at a moderatespeed.

In the accompanying drawings, Figure 1 is a perspective view of myimproved device. Fig. 2 is a vertical central crosssection of the same.Fig. 3 is a sectional detail.

A represents the bed of the fan-case, provided with wings or extensionsA, said bed being designed to be bolted or otherwise so cured to thefloor or ceiling, or any other con venient place in the building inwhich it is to be used. This bed with its wings I preferably make ofcast-iron, with its upper surface con- 3 5 forming in shape to theperiphery of the fancase B, which latter is cylindrical in shape, and ismade of sheet metal and bolted to the wings A of the bed A. At each endof the bed-plate I rigidly secure two arms of a four- 0 arm hanger, G,to the center of which is secured the proper boxes for carrying theshaft D, on which the wheel or fan is secured. The two upper arms of thehanger are fastened to the sheet-metal portion of the fan-ease,whichlatter entirely surrounds and closes the periphery of the wheel.

E represents a suitable hub or disk, having a solid center, It, andcircumferential flanges e, to which the inner ends of the blades F arerigidly secured by bolts or rivets passed 0 through flanges f, extendingin opposite directions and at right angles to the said inner ends. Saidblades are so constructed that their inner ends and side edges at thedisk travel nearly parallel with one another and parallel with thetravel of the wheel. Then they turn outward from the inner end of theblades spirally or screw-shaped until at the outer end of the bladesthey stand at or nearly an angle of one-eighth of a turn from the innerend, and a line drawn from the center of the disk or hub to the centerof the blades at their outer ends would pass directly across the centerof the face of the blade.

The reasons for this construction are as follows: The farther from thecenter toward the periphery of wheel the greater the velocity of itstravel, and hence a greater resistance of air, and the more air will beforced ahead and through the wheel, and it will be seen that if thewheel travels ten thousand feet per minute at the periphery, and onlyfive thousand feet at half-periphery, the outer portion of the wheelforces the air so much stronger than the inner portion that in casethere was the least obstruction in the airoutlet the air would passthrough the outer portion of wheel and back through the inner portion,providing the blades stood at the sameangle or pitch from the inner toouter ends; but I find by experiments that blades constructedspiral-shaped and mounted as described will retain the air evenly fromcenter to periphery, while it allows a free passage and flow of airdirectly through the wheel and case.

I am aware of the Patents Nos. 273,805 and 285,865, and make no claim tothe constructions shown therein as forming part of my invention.

It will be observed, on reference to Fi 1, that the bolts pass throughthe extension A and the case B into the hangers 0, thus firmlysecuring-these parts together.

hat I claim as my invention is- 1. The combination, with the base A,pro- 95 vided with the extensions A and the case B, of the hangers G,supporting the fan-case and fan-shaft, and firmly secured to saidextensions by the bolts 9, passing through said case and and at rightangles to said inner ends, and se- 10 extension into the ends of saidhangers, subcured between the flanges e of the hub by bolts stantiallyas described. passing through said flanges e andf substan- 2. In arotary fan, the combination,with the tially as and for the purposespecified. 5 base A, case B, hangers C, supporting said case, shaft D,and disk E, having a hub fitting WRIGHT SMITH the shaft andcircumferential flanges e, of the witnesses: spiral blades F, providedat their inner ends J O. MULFoRD,

with flanges f, extending in opposite directions T. F. WATSON.

